Head seal for an anti-dust helmet



FIG. 1 is a perspective view of a head seal for an anti-dust helmetshowing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a top plan view thereof.

The ornamental design for a head seal for an anti-dust helmet, as shown.